Light Control Switch Circuit

LIGHTING: LIGHTING SYSTEM: Light Control Switch Circuit
- Light Control Switch Circuit

DESCRIPTION

This circuit detects the state of the headlight dimmer switch.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK VEHICLE CONDITION

(a) Check the vehicle condition.

Result





HINT
There are no settings in the Data List related to the AUTO position, so proceed to "A" for all switch positions other than AUTO.

B -- INSPECT HEADLIGHT DIMMER SWITCH
A -- Continue to next step.

2. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the display on the Techstream.

Main Body (Main Body ECU)





OK:

Normal conditions listed above are displayed.

OK -- PROCEED TO NEXT INSPECTION PROCEDURE SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- Continue to next step.

3. INSPECT HEADLIGHT DIMMER SWITCH





(a) Remove the headlight dimmer switch.

(b) Measure the resistance of the switch.

Standard resistance:





NG -- REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY
OK -- Continue to next step.

4. CHECK WIRE HARNESS (MAIN BODY ECU - DIMMER SWITCH AND BODY GROUND)





(a) Disconnect the E12 headlight dimmer switch connector.

(b) Disconnect the IE and IJ instrument panel junction block connectors.

(c) Disconnect the E15 and E17 main body ECU connectors.

(d) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR

OK -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU)